Converted Observatory error-ref element

runtime/observatory/lib/src/elements/error_ref.dart

Index: runtime/observatory/lib/src/elements/error_ref.dart
diff --git a/runtime/observatory/lib/src/elements/error_ref.dart b/runtime/observatory/lib/src/elements/error_ref.dart
index d69726bdbb791d45a690d11fe1a349f9a9984e6c..b30dd90fbc2abc31b4b470dba8a32c70115f092e 100644
--- a/runtime/observatory/lib/src/elements/error_ref.dart
+++ b/runtime/observatory/lib/src/elements/error_ref.dart
@@ -1,13 +1,52 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library error_ref_element;
 
-import 'package:polymer/polymer.dart';
-import 'service_ref.dart';
+import 'dart:html';
+import 'dart:async';
+import 'package:observatory/models.dart'
+  show ErrorRef;
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
+
+class ErrorRefElement extends HtmlElement implements Renderable {
+  static const tag = const Tag<ErrorRefElement>('error-ref-wrapped');
+
+  RenderingScheduler<ErrorRefElement> _r;
+
+  Stream<RenderedEvent<ErrorRefElement>> get onRendered => _r.onRendered;
+
+  ErrorRef _error;
+  ErrorRef get error => _error;
+
+  factory ErrorRefElement(ErrorRef error, {RenderingQueue queue}) {
+    assert(error != null);
+    ErrorRefElement e = document.createElement(tag.name);
+    e._r = new RenderingScheduler<ErrorRefElement>(e, queue: queue);
+    e._error = error;
+    return e;
+  }
 
-@CustomTag('error-ref')
-class ErrorRefElement extends ServiceRefElement {
   ErrorRefElement.created() : super.created();
+
+  @override
+  void attached() {
+    super.attached();
+    _r.enable();
+  }
+
+  @override
+  void detached() {
+    super.detached();
+    children = [];
+    _r.disable(notify: true);
+  }
+
+  void render() {
+    children = [
+      new PreElement()..text = error.message
+    ];
+  }
 }